The Foreign Institutional Investors (FIIs) were net buyers to the tune of Rs 908.46 crore in the futures & option segment on Thursday.According to data released by the NSE, FIIs were net buyers of index futures to the tune of Rs 648.63 crore and bought index options worth Rs 305.80 crore. They were net sellers of stock futures to the tune of Rs 43.64 crore and sold stock options worth Rs 2.33 crore.As per data available on the Sebi website - FIIs were net buyers of stocks worth Rs 410.40 crore in the cash market on Wednesday. Mutual funds were net buyers of shares worth Rs 67.40 crore on the same day.